Timers And Counters - Snom 200 User Manual

using some automatic checks (UPnP, STUN). If this succeeds, it will setup
the necessary parameters automatically. If it fails, it will keep the pho-
ne with a local identity so that you can make phone calls in your private
network.
parameters. However, this mode is recommended only for experienced
users. If you dont want any NAT checkings at all, you can turn NAT de-
tection off.
tly, you must enter the STUN server address in dots-and-numbers nota-
tion (xxx.xxx.xxx.xxx:port) in the STUN server field. If you enter several
servers here (seperated by space), the phone will switch to the next STUN
server if the current STUN server fails.
lue is 15 seconds. TO reduce network traffic, you might want to increase
this value. However, this may cause ports to be closed before refreshing
and you are not reachable during this period.
transporting the media data with the settings for dynamic RTP port start
4
and end. The network identity that the phone should use can explicitly
be set with the fields network identity hostname and port and local SIP
port.
recommend reading our FAQ on this topic.

Timers and Counters

UDP packets for SIP in ms. The session timer describes how often a ses-
sion is refreshed, the fedault value is two hours. The other party might
propose a shorter time, which the phone will accept automatically.
transport the message. The default value is 70.
will use the TCP transport layer for sending SIP messages. The dafeult
value is 1300. If you want to disable TCP choose a big value like 99999, if
you always want to use TCP, choose 1.
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Automatic NAT detection will try to find a way to the internet
If you set NAT detection to static, you can manually set up the
If you dont want to check UPnP and name a STUN server explici-
The STUN binding interval can be manually setup. The default va-
You can restrict the RTP port range that the phone chooses for
If you want to set up your phone manually for NAT, we strongly
The Retry timer T1 and T2 define how fast the phone will resend
The Max-Forwards describes how many proxies at most may
The TCP threshold describes the value from which on the phone
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